Now Thats What we call a Summation!
Algebra
Level
4
\[\large \sum^\infty_{r=1} \frac{r^3+(r^2+1)^2}{(r^4+r^2+1)(r^2+r)} = \frac ab\]
The equation above holds true for coprime positive integers \(a\) and \(b\). Find \(a+b\).
by
Md Zuhair